71. With regard to the cornea:
a. it consists of 4 layers
b. surface ectoderm gives rise to the epithelium and Bowman’s layer
c. in the fetus it is more hydrated than in the adult
d. Descement’s layer is synthesized by the endothelium
e. the stroma layer arises from the mesenchyme
72. With regard to the cornea:
a. it consists of 4 layers
b. surface ectoderm gives rise to the epithelium and Bowman’s layer
c. in the fetus it is more hydrated than in the adult
d. Descement’s layer is synthesized by the endothelium
e. the stroma layer arises from the mesenchyme
73. The pupil:
a. varies between 4 and 10mm in diameter
b. is of the same size unless pathology exists
c. controls light entering the eye
d. miosis is the result of sphincter pupillae action under sympathetic
control
e. mydriasis is due to dilator pupillae relaxation
74. The iris:
a. is the most anterior extension of the uveal tract
b. divides the anterior segment into the anterior and posterior
chambers
c. is often cancave anteriorly due to the lens bulge
d. has a region called the collarette which lies 2mm from the
pupillary margin
e. receives innervation from the long and short ciliary nerves
75. The iris:
a. receives it’s blood supply from the long posterior ciliary
and
anterior ciliary arteries
b. a complete minor arterial circle is found at the collarette
c. drains into the vorticose veins
d. contains fenestrated vessels
e. has vessels with well developed tunica adventitia